Introduction of a biomimetic device designed to improve the flow over a slender delta wing: visualization study

IF 1.7 4区计算机科学 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Journal of Visualization Pub Date : 2024-02-19 DOI:10.1007/s12650-024-00961-7

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Abstract

One of the factors significantly influencing the flow structures and vortices formed on delta wings is the shape of the leading edge. This study examined the impact of needle vortex generators, inspired by owl wings, on the flow characteristics over a slender delta wing with a sweep angle of 65° to improve its aerodynamic performance. These nature-inspired vortex generators were designed to apply no additional flow blockage or drag force. Flow visualization tests were conducted in a smoke tunnel to gain deeper insights into the effects of the vortex generators on the flow physics over the delta wing. The experiments were performed at three angles of attack of 10°, 15°, and 20° and a flow velocity of 2.6 m/s on two delta wings, with and without needle vortex generators at the leading edge and a Reynolds number of Re = 2.6 × \({10}^{4}\) . Flow visualization was conducted on six longitudinal sections, six transverse sections, one-floor surface section, and one leading edge section at three different angles of attack. In addition, the investigation involved assessing the vortex breakdown location and wake region. The formation of the vortices and the effects of the needle vortex generators on the temporal and instantaneous flow structures and vortices were also investigated. The results suggested that the use of the needle vortex generators along the leading edge of the delta wing made the vortices smaller and closer to the wing surface and wing axis, postponed the vortex breakdown by approximately 13% of the chord length, and decreased the fluctuations of vortex breakdown location. In addition, the use of needle vortex generators eliminated the secondary vortices.

Graphical abstract

Abstract Image

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引入旨在改善细长三角翼上气流的仿生物装置：可视化研究

摘要三角翼前缘的形状是影响其流动结构和涡流形成的重要因素之一。本研究考察了受猫头鹰翅膀启发而设计的针状涡流发生器对扫掠角为 65° 的细长三角翼上流动特性的影响，以改善其空气动力性能。这些受大自然启发而设计的涡流发生器不会产生额外的流动阻塞或阻力。在烟道中进行了流动可视化测试，以深入了解涡流发生器对三角翼上流动物理的影响。实验在两个三角翼上分别以 10°、15° 和 20°三个攻角和 2.6 m/s 的流速进行，前缘分别安装和未安装针状涡流发生器，雷诺数为 Re = 2.6 ×\({10}^{4}\) 。在三个不同的攻角下，对六个纵向截面、六个横向截面、一个地板表面截面和一个前缘截面进行了流动可视化。此外，调查还包括对涡旋破裂位置和尾流区域的评估。还研究了涡流的形成以及针状涡流发生器对时间和瞬时流动结构和涡流的影响。结果表明，在三角翼前缘使用针状涡流发生器可使涡流更小、更靠近翼面和翼轴，将涡流击穿时间推迟约 13% 的弦长，并减少涡流击穿位置的波动。此外，针状涡流发生器的使用消除了次级涡流。图表摘要

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来源期刊

Journal of Visualization COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS-IMAGING SCIENCE & PHOTOGRAPHIC TECHNOLOGY

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

>12 weeks

期刊介绍： Visualization is an interdisciplinary imaging science devoted to making the invisible visible through the techniques of experimental visualization and computer-aided visualization. The scope of the Journal is to provide a place to exchange information on the latest visualization technology and its application by the presentation of latest papers of both researchers and technicians.